flow testing Model A Zenith carb jets
 

Can anyone explain the reason for flow testing Model A Zenith carb jets with a 36 inch water column instead of the 37 1/4inch column as used by Ford? Thank you.

Re: flow testing Model A Zenith carb jets
 

here u go.

Re: flow testing Model A Zenith carb jets
 

Here are some charts to make life easy.

http://www.fordgarage.com/pages/jetflowrates.htm

I tested many jets using the Ford column length.

I did a lot of error checking and repeating and found the results were very consistant.

Most seemed to flow too much by a little to a lot and some were on the money. A few did not have a nice stream indicating there was a problem with the hole and flow.

Re: flow testing Model A Zenith carb jets
 

I have rebuilt and sold over 200 model A zenith carbs and have always gone by the drill size for all the jets...Merry Christmas

Re: flow testing Model A Zenith carb jets
 

One thing I have seen someplace is; when soldering the hole up to resize, how thick the solder is before you redrill the hole can change the rate of the flow. So if it calls for X size hole, might have to go to larger or smaller drill to get the correct flow.

Re: flow testing Model A Zenith carb jets
 

https://www.fordbarn.com/forum/attac...p;d=1638407572

Technical Note on Flow-Testing - Gary WA